Lock



' A. TARJAN.

LOCK. APPLICATION FILED JULY 14, 1920.

Patented Apr. 12, 1921.

' A b mmm, or restart LOCK.

Specification of Letters latent.

Application filed July 14, 1920. Serial No. 396,327.

T 0 all whom it may concern Be it known that I ANDoR citizen of Austria, residing at Vienna, Austria, have invented new and useful Improvements in Locks, of which the following is a specification.

The present invention relates to a lock provided with tumblers actuated in known manner by the stepped key bit, and with hollow bolt incasing said tumblers.

According to this invention the port10n of the bolt engaging the opening of the plate fixed on the door or the like, is formed by suitably bending so as to constitute a casing which is closed at all sides except at the inner end, and may be stiffened at its open month by a pin traversing the1nte rior of the hollow bolt and cooperating with the tumblers to hold the bolt in looking or unlocking position.

The annexed drawings show by way of example the improved lock.

Figure 1 is a plan view with part of the casing broken away.

Fig. 2 shows the bolt in a perspectlve view.

In the embodiment shown the portion of the bolt 1, which may engage the opening of a fixedplate (not shown) is pro vided with a recess 2 being preferably of parallelepipedic form, said recess being open at the interior end, as shown at 3, so that tumblers 4 may be introduced into the said recess 2 of the bolt. The tumblers 4: are juxtaposed within the recess 2 and are guided by the inner side walls of the recess 2. There are arranged preferably three to five tumblers. Each of the tumblers 4c is actuated by a spring 5 and may be shifted around a common pin 7 secured to the lock plate 6. The bolt 1 will be fixed in its position after each revolution of the key by a stay pin 8 passing from one side wall of the bolt to the other.

Said pin will be engaged after each complete revolution of the key by one of the' notches 9 of the tumblers 4, so that the bolt will be prevented from further movement.

The bolt 1, as shown in Fig. 2, may be manufactured from a single piece of sheet metal. For this purpose the sheet metal piece will be stamped in the proper form and bent according to the proper lines, so

TARJAN, a

that the parallelepipedic recess 2 will be formed, which is only open at a single side or at its inner end. After the sheet has been bent the adjacent edges of the same are preferably soldered o'r welded.

Patented Apr. 12, 1921.

The before described arrangement has the advantage that besides the decreasing of the constructlonal length of the lock, the port10n of the hollow bolt, leaving the easing,even in case of a lock the key of which may be revolved twice, is completely closed outslde 1n its entire length. This portion, therefore, appears to be a solid piece and the stay pin 8 never clears the casing of the lock.

One end of the cover 10 is preferably semlcyllndrically formed. In the center of such semicylinder a smallcone 11 is pressed outward from the cover 10. This has the advantage that the mounting of the lock is thereby much simplified and facilitated. After the key hole is formed in the wood material the known key tube 12 will be ins troduced and the lock pressed in proper position toward the wood material. Thereby the small cone enters the wood material and marks the point for boring out a recess to receive the rounded end of casing 10.

The wood material which is to betaken.

out further will be worked out or hollowed by means of a chisel in a well known manner. Therefore only 'as much of the wood material will be taken out as is exactly I necessary for properly lodging the lock. By the boring the danger of splitting or cracking is perfectly avoided and this circumstance is of great importance in connection with expensive woodwork. Cla1ms:.

1. In a lock the combination of tumblers,

a hollow bolt incloising the tumblers, the outer portion of which bolt being formed by bending a sheet metal. piece so as to constitute a casing which is completely closed except at its inner end, and means for stiffening the hollow casing atsuch open end, said means serving also as a fence for cooperation with the tumblers to lock the bolt 1 in position at each revolution of the key.

2. In a lock the combination of a hollow bolt, the outer portion of which being formed by a bent sheet metal piece-so as to constitute a casing completely closed except at its inner end, a pin between the side walls of the hollow casing and tumblers with which said pin cooperates.

3. In a lock the combination of a hollow 5 bolt, having an outer portion comprising a bent sheet metal piece constituting a-casing completely closed except at its inner end a,

pin between the side walls of the hollow casing and tumblers with which said pin cooperates the inner portion of the bolt be- 10 ing an extension of one side wall of the bolt and cooperating with the key bit. In testimony whereof I affix my signature.

ANDOR TARJ AN. 

